I had a Garmin Oregon. Piece of ****. It would power down almost at random, like if I asked for an elevation plot while I was following a previous track or route, or if I tried to save a track with a certain name, instead of doing what I'd want, it would just turn off. Eventually I returned it for another Oregon - the lady at REI suggested going from a 400 to a 550t, said they might have fixed some of the bugs. Garmin markets them as waterproof; mine died of water damage when I got caught hiking in a storm with a lot of rain.

Don't waste your money on a $400 paperweight.